21 20.25 16.74 15.39 12.42 8.87 0 2 4 6 8 10 12 14 16 18 20 22 24 0 2 4 6 8 10 12 14 16 18 20 T4002 OUTPUT SIGNAL PRESSURES A I R C O N S U M P T I O N S C F H This chart illustrates the flow of compressed air to atmosphere through a Johnson Control T4002, with various air leaks on its output signal line. For example: If the air leak caused an output signal pressure drop from 20 PSIG to 4 PSIG, the leak would consume 20.25 SCFH of compressed air. The red numbers indicate the quantity of thermostats that could be served by the air leak at the SCFH value in green. The air leak causing a drop in output to 4 PSIG could normally serve 52 thermostats. T4002 normal air consumption with 20 psig main air is .39 SCFH 54 52 43 40 32 23 JOHNSON CONTROLS T4002 TOTAL AIR CONSUMPTION (SCFH) WITH BRANCH LINE LEAKS CAUSING VARIOUS PRESSUR DROPS 3.27
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